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From "Sharad Agarwal (JIRA)" <j...@apache.org>
Subject [jira] Commented: (MAPREDUCE-372) Change org.apache.hadoop.mapred.lib.ChainMapper/Reducer to use new api.
Date Tue, 13 Oct 2009 08:13:31 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-372?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12764996#action_12764996
] 

Sharad Agarwal commented on MAPREDUCE-372:
------------------------------------------

Some comments:
Access to Chain#throwable must be thread safe.
Poll in ChainRecordReader#readFromQueue() and ChainRecordWriter#writeToQueue() is not efficient.
Can we use wait/notify mechanism instead ?

> Change org.apache.hadoop.mapred.lib.ChainMapper/Reducer to use new api.
> -----------------------------------------------------------------------
>
>                 Key: MAPREDUCE-372
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-372
>             Project: Hadoop Map/Reduce
>          Issue Type: Sub-task
>            Reporter: Amareshwari Sriramadasu
>            Assignee: Amareshwari Sriramadasu
>             Fix For: 0.21.0
>
>         Attachments: mapred-372.patch, mapred-372.patch, mapred-372.patch, patch-372-1.txt,
patch-372.txt
>
>


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